/*!	 valuenode_blinereversetangent.cpp
**	 Implementation of the "Reverse Tangent" valuenode conversion.
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**	Copyright (c) 2007, 2008 Chris Moore
**  Copyright (c) 2011 Carlos López
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include "valuenode_blinereversetangent.h"
#include "valuenode_bline.h"
#include "valuenode_const.h"
#include "valuenode_composite.h"
#include <synfig/general.h>
#include <synfig/localization.h>
#include <synfig/valuenode_registry.h>
#include <synfig/exception.h>
#include <ETL/hermite>
#include <ETL/calculus>

#endif

using namespace std;
using namespace etl;
using namespace synfig;

REGISTER_VALUENODE(ValueNode_BLineRevTangent, RELEASE_VERSION_0_61_08, "blinerevtangent", "Reverse Tangent")

ValueNode_BLineRevTangent::ValueNode_BLineRevTangent(Type &x):
    LinkableValueNode(x)
{
}

ValueNode_BLineRevTangent::ValueNode_BLineRevTangent(const ValueNode::Handle &x):
    LinkableValueNode(x->get_type())
{
    Vocab ret(get_children_vocab());
    set_children_vocab(ret);

    if (x->get_type() != type_bline_point) {
        throw Exception::BadType(x->get_type().description.local_name);
    }

    set_link("reference", x);
    set_link("reverse", ValueNode_Const::create(bool(false)));
}

ValueNode_BLineRevTangent*
ValueNode_BLineRevTangent::create(const ValueBase &x)
{
    return new ValueNode_BLineRevTangent(ValueNode_Const::create(x));
}

LinkableValueNode*
ValueNode_BLineRevTangent::create_new()const
{
    return new ValueNode_BLineRevTangent(get_type());
}

ValueNode_BLineRevTangent::~ValueNode_BLineRevTangent()
{
    unlink_all();
}

ValueBase
ValueNode_BLineRevTangent::operator()(Time t)const
{
    if (getenv("SYNFIG_DEBUG_VALUENODE_OPERATORS")) {
        printf("%s:%d operator()\n", __FILE__, __LINE__);
    }

    if ((*reverse_)(t).get(bool())) {
        BLinePoint reference((*reference_)(t).get(BLinePoint()));
        BLinePoint ret(reference);
        ret.reverse();
        return ret;
    } else {
        return (*reference_)(t);
    }
}

bool
ValueNode_BLineRevTangent::set_link_vfunc(int i, ValueNode::Handle value)
{
    assert(i >= 0 && i < link_count());

    switch (i) {
    case 0:
        CHECK_TYPE_AND_SET_VALUE(reference_, get_type());

    case 1:
        CHECK_TYPE_AND_SET_VALUE(reverse_,   type_bool);
    }

    return false;
}

ValueNode::LooseHandle
ValueNode_BLineRevTangent::get_link_vfunc(int i)const
{
    assert(i >= 0 && i < link_count());

    switch (i) {
    case 0:
        return reference_;

    case 1:
        return reverse_;
    }

    return 0;
}

bool
ValueNode_BLineRevTangent::check_type(Type &type)
{
    return (type == type_bline_point);
}

LinkableValueNode::Vocab
ValueNode_BLineRevTangent::get_children_vocab_vfunc()const
{
    if (children_vocab.size()) {
        return children_vocab;
    }

    LinkableValueNode::Vocab ret;

    ret.push_back(ParamDesc(ValueBase(), "reference")
                  .set_local_name(_("Reference"))
                  .set_description(_("The referenced tangent to reverse"))
                 );

    ret.push_back(ParamDesc(ValueBase(), "reverse")
                  .set_local_name(_("Reverse"))
                  .set_description(_("When checked, the reference is reversed"))
                 );

    return ret;
}